Continuously, after a fixed time interval, the browser freezes/becomes unresponsive momentarily, and then becomes responsive again. === TRY : Type "about:config" === Find or locate the preference "dom.min_background_timeout_value" === open up the dialogue box "Enter Integer Value" === change the previous value (which will be y default less than 1000) to a very large value, lets say 1000000

Mozilla has created a support page that lists all the connections that Firefox make without explicit permission of the user. As you can see, quite a few are listed there. While some are enabled after user activity, for instance adding live bookmarks to the browser, others are enabled by default. This guide looks at the latter kind, explains what their use is, and how you can disable them if you do not require them.